[gentoo-user] Clock/Daylight Savings

[gentoo-user] Clock/Daylight Savings

[Randy Barlow]

Ever since the new daylight savings change, my clock hasn't done the 
"Spring Forward".  I use ntp and the like, and it seems happy being 
behind by an hour.  I can use the date command to set it correctly, but 
after the next reboot it's back to its old games.  Pointers?

R
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Re: [gentoo-user] Clock/Daylight Savings

[Rostislav]

On Thu, 19 Apr 2007, Randy Barlow wrote:

>  Ever since the new daylight savings change, my clock hasn't done the "Spring 
>  Forward".  I use ntp and the like, and it seems happy being behind by an 
>  hour.  I can use the date command to set it correctly, but after the next 
>  reboot it's back to its old games.  Pointers?
> 
>  R

There are two different clocks: system clock controlled by kernel and hardware clock. 
The latter is used to set up the system clock at the boot time.
Seems like it wasn't changed with daylight savings change. 
Use "hwclock --systohc" to set hardware clock to the current system
time.

Regards,
Rostislav.
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Re: [gentoo-user] Clock/Daylight Savings

[Elias Probst]

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On Thursday 19 April 2007 09:36:07 Rostislav wrote:
> Seems like it wasn't changed with daylight savings change.
> Use "hwclock --systohc" to set hardware clock to the current system
> time.

If you don't use a dualboot system, just the this option in /etc/conf.d/clock:

# If you want to set the Hardware Clock to the current System Time
# during shutdown, then say "yes" here.
CLOCK_SYSTOHC="yes"


Regards,
Elias P.

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[gentoo-user] Re: Clock/Daylight Savings

[Anno v. Heimburg]

Randy Barlow wrote:

> "Spring Forward".  I use ntp and the like, and it seems happy being
> behind by an hour.  I can use the date command to set it correctly, but
> after the next reboot it's back to its old games.  Pointers?

Check that you have your timezones set correctly. Unix systems track time in
UTC or Greenwich Mean Time*, that internal date is then converted to local
time using the timezone you set. During that conversion process DST
adjustment happens, too. All that ntp does is make sure that your system
time in UTC is correct. If your conversion to local time is incorrect, ntp
can do nothing about it. Similarly, the hardware clock is also set to UTC.

Your problem, especially considering you run ntp, seems to be a
UTC-to-local-time conversion issue rather than an incorrectly adjusted UTC
clock.

HTH,
Anno.



*) Actually in number-of-seconds since January 1, 1970, 00:00 UTC.

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Re: [gentoo-user] Re: Clock/Daylight Savings

[Randy Barlow]

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Anno v. Heimburg wrote:
> Check that you have your timezones set correctly.

In /etc/conf.d/clock I have:

TIMEZONE="America/New_York"

This should be what it takes to get my system to the correct time I
think!  Any other ideas?

R
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Re: [gentoo-user] Clock/Daylight Savings

[Boyd Stephen Smith Jr.]

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On Thursday 19 April 2007 04:10:58 Randy Barlow wrote:
> Ever since the new daylight savings change, my clock hasn't done the
> "Spring Forward".  I use ntp and the like, and it seems happy being
> behind by an hour. 

ntp (and the like) use UTC, which does not "Spring Forward" or "Fall Back", 
as 
everything that really cares about accurate time should.

> I can use the date command to set it correctly, but 
> after the next reboot it's back to its old games.  Pointers?

You probably need to make sure your TIMEZONE in /etc/conf.d/clock and/or 
or /etc/localtime are set properly.

Generally, you DON'T want to set them to CST (or similar) since that 
doesn't 
sf/fb either (instead most of the area covered by CST switches to CDT), 
although some like CST6CDT might work.

Instead you'll want to use (Type/)Region/(SubRegion/)City for a city that 
uses 
the same timezone rules as you.  E.g. America/Chicago, 
America/Kentucky/Monticello, posix/US/Central, or 
right/America/Indiana/Knox

(All the timezones supported by your libc are under /usr/share/zoneinfo.)

-- 
Boyd Stephen Smith Jr.                     ,= ,-_-. =. 
bss03@volumehost.net                      ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy           `-'(. .)`-' 
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Re: [gentoo-user] Clock/Daylight Savings

[Dan Cowsill]

I dual boot windows on my system, and for some reason, windows can't
keep the time straight after the change.  What used to happen is I'd
have openntp sync my clock, then restart to play some games.  After
booting back into Gentoo, ntpd would see such a large difference in
what the time is supposed to be and what it actually is according to
the hwclock that it just wouldn't sync!

The solution was to use ntpclient on default runlevel, as it just
syncs the clock with no special conditions.  Of course, you can run
both if your into that sort of thing.  I use ntpd to set my clock to
UTC time and then use zoneinfo to set it back to Eastern Standard.
Works like a charm.  Oh, and UTC is generally a good idea because it
isn't affected by daylight savings time at all :)

Hope this helps.

-- 
-·=»Ðŧħ«=·-

Re: [gentoo-user] Clock/Daylight Savings

[Boyd Stephen Smith Jr.]

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On Thursday 19 April 2007, "Dan Cowsill" <danthehat@gmail.com> wrote 
about 'Re: [gentoo-user] Clock/Daylight Savings':
> I dual boot windows on my system, and for some reason, windows can't
> keep the time straight after the change.

Windows expects the hardware clock to be in local time.  (Open)NTPd uses 
UTC for all it's time values.  You have to do some magic that I don't know 
to get Linux/BSD ntp daemons to play well with windows *and* properly 
correct for time.

-- 
Boyd Stephen Smith Jr.                     ,= ,-_-. =. 
bss03@volumehost.net                      ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy           `-'(. .)`-' 
http://iguanasuicide.org/                      \_/     

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Re: [gentoo-user] Clock/Daylight Savings

[Neil Walker]

Boyd Stephen Smith Jr. wrote:
> Windows expects the hardware clock to be in local time.  (Open)NTPd uses 
> UTC for all it's time values.  You have to do some magic that I don't know 
> to get Linux/BSD ntp daemons to play well with windows *and* properly 
> correct for time.

Well, "CLOCK="local"" in /etc/conf.d/clock works for me on my dual boot 
system. ;)


Be lucky,

Neil

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Re: [gentoo-user] Clock/Daylight Savings

[Alan McKinnon]

On Thursday 19 April 2007, Boyd Stephen Smith Jr. wrote:
> On Thursday 19 April 2007, "Dan Cowsill" <danthehat@gmail.com> wrote
>
> about 'Re: [gentoo-user] Clock/Daylight Savings':
> > I dual boot windows on my system, and for some reason, windows
> > can't keep the time straight after the change.
>
> Windows expects the hardware clock to be in local time.  (Open)NTPd
> uses UTC for all it's time values.  You have to do some magic that I
> don't know to get Linux/BSD ntp daemons to play well with windows
> *and* properly correct for time.

Can that even be done without a kludge?

The only method I can think of would be to adjust the Windows time when 
it boots, and to ensure Windows never updates the hardware clock.

My TZ is GMT +2, and on my own dual-boot machines I had to decide 
whether *nix or Windows would have broken time settings. I'm happy to 
report that the decision was really a no-brainer...

alan

-- 
Optimists say the glass is half full,
Pessimists say the glass is half empty,
Developers say wtf is the glass twice as big as it needs to be?

Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
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Re: [gentoo-user] SOLVED: Clock/Daylight Savings

[Randy Barlow]

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Randy Barlow wrote:
> Ever since the new daylight savings change, my clock hasn't done the
> "Spring Forward".  I use ntp and the like, and it seems happy being
> behind by an hour.  I can use the date command to set it correctly, but
> after the next reboot it's back to its old games.  Pointers?

It turns out that I had copied the EST timezone to /etc/localtime, but
had my TIMEZONE set to America/New_York.  I copied the America/New_York
time zone to /etc/localtime, rebooted, and it worked!  Thanks for all
the suggestions gentooers!

R
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